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suinotsuki · 1 year

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College AU: Behind Closed Doors (And One That Wasn’t)

A/N: I just decided to post my fanfics also here on Tumblr. But, all of these are cross-posted to my AO3 account too along with the other SenHaku Week 2021 fanfics of mine! Fanfic Links: AO3 | FF.net

Other Links: Dr. Stone Masterlist

College AU where Kohaku and Senku deal with being roommates. SenHaku Week 2021 Day 3: Roommates

Stone University was the most prestigious school in the country.

The school with their top-notch classes gave birth to genius professionals. That’s why a lot of famous people from various fields came here. Not only did they have tough entrance exams, but the freshmen year was also hellish. But after the gruesome first year, the students could customize a schedule fit for them. Some would say the school had a complicated system.

However, the dorm was more unpredictable.

The students were required to live in the residence hall after the gruesome first year. The rooms were spacious enough to do anything they want. There was a kitchen, a bathroom, beds, closets, and a vacant space. It seemed perfect, but the administration has a way of matching roommates randomly.

It was random enough that two people were having a hard time figuring out the current arrangement.

"Lioness, do you know why they paired us up?" Senku asked as he set down the last of his boxes.

"I'm not a lioness!" Kohaku huffed. "I don't know. I was supposed to be with Ruri."

"I never heard siblings in different years being roommates."

"There was one before!"

"They were twins." The scientist stuck a finger in his ear and observed the red-faced blonde.

In the end, she turned back to unpacking the rest of her luggage.

They were definitely off to a good start.

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The two roommates were already familiar with each other before they lived in the same room.

They came across each other frequently despite being in different programs and clubs. Ruri and Rei were to thank for that. It was the same for their friends. Still, they weren't able to really interact a lot back then. It was only until they became roommates that they got to know each other. Not just their quirks, but also their different studying habits.

Senku glanced from his tablet when he heard a loud thump. Kohaku was troubled again. He knew from the six months of being together that she'd lightly hit her head on the table when she was frustrated with her studies. Tonight was one of those times. He couldn't blame her. Cramming for the finals have always been ten billion percent a pain.

However, he was wondering why did the girl choose Radiologic Technology as her course out of everything. With how active she was in sports clubs, he almost thought she was in Sports Science. She was very involved in the school. A small smile found its way to his lips. He really admired her ability to juggle her academics and extracurriculars.

"Senku," Kohaku called out. She turned her head to face him. "What's wrong?"

A perceptive lioness, as usual. The boy adjusted from his seat before asking. "Why did you take your course?"

The girl sat up straight and Senku couldn't help but notice how her blue eyes were full of emotions. "We had to rush Ruri to the hospital before. The radiologist there discovered my sister had pneumonia. If we found out late, she would have died."

"Ruri has been doing well already."

"And, I'm happy about that." Kohaku smiled. "I wanted to be like that radiologist. I wanted to save people like her."

The two settled into silence once she was done speaking. There were no more words to be said. It wasn't awkward. It was... comfortable.

The night continued with a peaceful silence around them.

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By the time they hit their junior year, their schedules were different from each other.

Senku's timetable was filled with classes in the morning. By the time it was afternoon, he was either in his club or in their room. Her roommate was mostly spending his time crafting a spacecraft. Whether it was his own choice or because his program demanded it, he was occupied.

Kohaku was busier. She alternated her schedule between classes and clubs. The girl claimed that staying still and listening to all the lectures were going to drive her crazy. It's why she opted to squeeze her clubs in the middle to get some fresh air. She even had to practice for competitions from time to time.

The two developed a routine throughout the time they spent. They always had dinner together despite their busy schedules. If they couldn't, they'd grab a snack at least.

After coming from a long tiring kendo practice, the lioness desperately needed a shower. She opened the door to their room and was greeted by the cold air. Her grip on the box full of mille-feuille tightened as she shivered. She couldn't let the box drop to the floor. It was their snack before Senku leaves for dinner with Byakuya, Lillian, and Rei.

"Senku, it's too co-" Kohaku stopped upon seeing the Aerospace Engineering student asleep on his desk. The afternoon sun was the only thing illuminating their room, and it created a paradisical image of their space. She would have continued to be in trance at the scene in front of her if it wasn't for the soft rustling sound of the papers on the floor.

Placing the box of sweets on the kitchen counter, she tiptoed to his bed and took the neatly folded blanket. The girl unfolded it with a flourish sending some papers flying. She'd pick that up later. For now, she should make sure her roommate won't be freezing by the time she finishes her bath.

She was fast to clean up the room. She had to. There are two more hours until his family arrives.

As she was about to get into the bath, courage struck her. The blonde glanced back to the sleeping figure by the window. The silly thought in her head pushed her forward to do something uncharacteristic. With steps as light as a fairy, Kohaku hurried to his side and planted a gentle kiss. She practically ran to the bathroom after that.

And if Senku felt her lips on his exposed forehead, he didn't dare to open his eyes and speak of it.

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When their senior year started, the roommates already gained an almost perfect understanding of each other.

That included the awful luck one student has.

Days before his thesis defense, Senku just had to be down with a fever. It wasn't the kind that will immediately go away with a good night's sleep. He struck gold with the one that made him incapacitated to move. On the bright side, he didn't have to prepare for the defence.

"I'm sorry, lioness." The engineering student weakly apologized.

From the small kitchen, Kohaku resisted the urge to snap at the nickname. It wouldn't do them good if she did. He needed rest more after 'accidentally' overworking himself. He should conserve his energy more.

The blonde decided to focus on cooking the ramen. No matter how sick he was, he always had the appetite for it. It's one of the reasons why she decided to learn to cook it from him. The taste wasn't like the one they bought in the ramen house an hour away from the university, but it was close enough.

Taking care of Senku was definitely a piece of cake for her. She already did this many times not only to him but also to her sister. When the food was cooked, she made sure he was propped up and the ramen wasn't steaming hot for him to eat. They ate in silence with the lioness having to spoonfeed him.

Once they were done, Kohaku got busy cleaning up. The earlier she could get the boy to rest, the better. She still had to smooth things out for her practicals. He might be almost done with his requirements, but she still had two to fix.

"Kohaku?" Senku called her name as she tucked him in.

The lioness swore her heart skipped a beat. "Yes?"

"Thank you." And with that, the boy placed a tiny kiss on her forehead and he sleepily chuckled. "I remember that too."

No more than a minute did he fall asleep, leaving her shocked from his actions. She held her face as a blush slowly crept to her face. Memories of the stunt she did a year ago rushed to the surface, and she felt more embarrassed than ever.

And if Senku felt her kiss from before, he did dare to speak of it while in a state of a delirious fever.

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Stone University always had a graduation party for graduates.

It was an event where alumnae and outsiders were welcomed to wander around the school's residence halls. Some freshmen would take this opportunity to have a sneak peek of their stay. For the seniors, it was their last opportunity to have a feel of their second home.

Kohaku and Senku stood in the middle of their room, taking one last look at everything before they start packing tomorrow. They weren't the type to feel melancholic. It wasn't like they couldn't help it. There were so many memories of their stay here.

Honestly, they still didn't know why the school administration decided to put them in the same room.

"Senku!"

"Kohaku."

The graduates turned their attention to the source of the voice. They found Rei and Ruri smiling at them from the doorway.

"Ruri? Rei?" Kohaku tilted her head to the side.

"We knew you'd be here!" Rei answered as she bounded to Senku with a bouquet of hydrangeas. "After all, we picked out this room for the two of you!"

"We hope you had a lot of good memories here. Congratulations on graduating." Ruri casually said.

For a while, the two roommates weren't sure if they heard Rei correctly. They turned their heads toward each other and looked back at their older sisters. If Ruri and Rei picked out this room for them, then...

"Rei, did you just say..." Senku trailed off.

"We picked out this room for the two of you!" His older sister repeated, but this time with a more cheerful voice.

"But, how?" The younger blonde exclaimed.

"As part of the student council, we had privileges." Ruri glanced at Rei. "Since Rei and I were friends, we thought the two of you might get along well too."

Silence.

The room was so silent you could hear a pin drop. It was a needed silence though. Whatever theory Senku and Kohaku had before, it was proven wrong in an instant by their sisters.

"All this time, we believed ten billion percent that the administration was behind it." Senku chuckled. "I didn't consider the student council. That explains why the school got crazier when Ryusui became president."

"Ruri, why didn't you tell me?" Kohaku asked her sister.

Ruri made an apologetic face. "Sorry. It was supposed to be a surprise."

"Anyway, you're missing such a great party downstairs!" Rei pulled on Senku's hands. "Let's go."

"Rei, can you give us a minute?" Ruri and Rei glanced at each other until the older blonde smiled knowingly.

Kohaku smiled when their older sisters left. It would probably be a long time before she and Senku would be able to meet again. They already have promising futures ahead of them. They would be busy with their lives.

Before any of them could say a word, the two closed the distance and tightly hugged each other. Three years. It took them three years to have this kind of hug.

It wasn't the end, but they might as well start with one hug.

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